to have its roots in sth or to have its root in sth
(in general sense)根源于…；起因于…
+of feeling源于…；植根于…
His sense of guilt had its roots in his childhood loss of his younger sister.他负罪感的根源在于孩童时代妹妹的死去。
+ problem, disease根源是…；根本原因是…
Many diseases have their roots in the genetic make-up of the individual.许多疾病的根源在于个体的基因构成。